US7042682B2 - Fully shielded perpendicular recoding writer - Google Patents

Fully shielded perpendicular recoding writer Download PDF

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Publication number
US7042682B2
US7042682B2 US10688046 US68804603A US7042682B2 US 7042682 B2 US7042682 B2 US 7042682B2 US 10688046 US10688046 US 10688046 US 68804603 A US68804603 A US 68804603A US 7042682 B2 US7042682 B2 US 7042682B2
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Prior art keywords
shield
write pole
downstream
upstream
side shields
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US20050083605A1 (en )
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Hung Liang Hu
Yaw Shing Tang
Liji Guan
Kochan Ju
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Headway Technologies Inc
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Headway Technologies Inc
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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127Structure or manufacture of heads, e.g. inductive
    • G11B5/1278Structure or manufacture of heads, e.g. inductive specially adapted for magnetisations perpendicular to the surface of the record carrier
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/10Structure or manufacture of housings or shields for heads
    • G11B5/11Shielding of head against electric or magnetic fields
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127Structure or manufacture of heads, e.g. inductive
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127Structure or manufacture of heads, e.g. inductive
    • G11B5/31Structure or manufacture of heads, e.g. inductive using thin films
    • G11B5/3109Details
    • G11B5/3116Shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect, equalizing, side flux fringing, cross talk reduction between heads or between heads and information tracks
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127Structure or manufacture of heads, e.g. inductive
    • G11B5/31Structure or manufacture of heads, e.g. inductive using thin films
    • G11B5/3109Details
    • G11B5/313Disposition of layers
    • G11B5/3143Disposition of layers including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding
    • G11B5/3146Disposition of layers including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding magnetic layers
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127Structure or manufacture of heads, e.g. inductive
    • G11B5/31Structure or manufacture of heads, e.g. inductive using thin films
    • G11B5/3109Details
    • G11B5/313Disposition of layers
    • G11B5/3143Disposition of layers including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding
    • G11B5/3146Disposition of layers including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding magnetic layers
    • G11B5/315Shield layers on both sides of the main pole, e.g. in perpendicular magnetic heads

Abstract

Conventional perpendicular writers that utilize an extended return pole are subject to large flux leakage. This problem has been reduced in the prior art by adding a downstream shield. This still leaves significant upstream leakage. This has now been eliminated by adding an upstream shield and then connecting the up and downstream shields by using side shields. The latter need not extend all the way from the downstream to the upstream shield in which case their thickness is increased relative to the full side shields.

Description

FIELD OF THE INVENTION

The invention relates to the general field of magnetic disk systems with particular reference to magnetic write heads for perpendicular designs, more specifically to flux leakage from the write pole.

BACKGROUND OF THE INVENTION

Perpendicular magnetic recording (PMR) is important for the future of the magnetic recording industry because it offers higher areal density than the current longitudinal magnetic recording (LMR). This is due to the fact that the P medium is thermally more stable than that used for LMR. At present, LMR has achieved over 100 Gigabits per square inch (Gbpsi) in the laboratory and more than 60 Gpsi in products currently offered at the market place. In order to further extend the LMR recording density, two main obstacles have to be overcome. The first one is the thermal stability of the LMR recording media which arises because its thickness has to decrease to the extent that thermal energy could randomize the recorded bits. The second one is the ongoing increase in the write field needed to record on the high coercivity LMR media.

This high coercivity is needed to achieve high bit resolution and good thermal stability. Both obstacles to LMR could be considerably lowered if PMR were deployed instead. Thicker PMR media with a magnetically soft under-layer film (SUL), could be used to alleviate the thermal stability problem. A PMR writer provides a larger write field than that of LMR, which is limited to the fringe field from its write gap.

An example of a perpendicular writer of the prior art is shown in FIG. 1. Magnetic yoke 11 is surrounded by field coil 12 and includes main pole 13 that terminates as a write pole tip at the recording surface. Return pole 14 conveys the magnetic flux generated by coil 12 down to within a distance S of the recording surface 16 while downstream shield 15, running parallel to the recording surface, completes the magnetic circuit with the exception of gap g1 into which some of the write field is diverted. The main flux passes through recording layer 17, into SUL 16, and then back up into downstream shield 15 on the far side of g1.

One of the problems for a PMR writer of the type seen in FIG. 1 is the extent to which its write field spreads to its surroundings, thereby jeopardizing the stability of the recording bits. One approach to dealing with this has been the approach described above namely the introduction of a downstream shield (15 in FIG. 1) that is separated by a small gap (g1) from the PMR write pole so as to minimize the amount of flux returned from the PMR media. However, we have found that this solution to the wide spreading fringe fields problem is not quite adequate.

As shown in the attached simulation plots:—FIG. 2 a shows the field plots for a single pole writer without a downstream shield while FIG. 2 b shows the field plots for a single pole writer with a downstream shield, with the left side of the graph relating to the downstream end (i.e. the mirror reflection of FIG. 1). It is clear that the downstream shield has indeed reduced side fringing in the downstream fields, but there is still a large side fringing field spread on the upstream side, affecting the adjacent track recording bits. In this case, there could be as much as 20% of the maximum write field applied to the adjacent upstream tracks which could cause its randomization after repeated writing in the presence of thermal disturbance. Such a situation is obviously very undesirable for high track density recording.

A routine search of the prior art was performed with the following references of interest being found:

In U.S. Pat. No. 4,656,546 (Mallory) describe a downstream shield. In U.S. Pat. No. 5,003,423, Imamura et al disclose pole shields on the sides, upstream, and downstream. Das, in U.S. Pat. No. 5,075,956, shows a magnetic pole with side shields. Gill et al in U.S. Pat. No. 5,621,592 and also in U.S. Pat. No. 5,515,221, teach laminated shield layers.

SUMMARY OF THE INVENTION

It has been an object of at least one embodiment of the present invention to provide a magnetic writer suitable for vertical recording.

Another object of at least one embodiment of the present invention has been that said writer have minimal upstream and downstream flux leakage.

These objects have been achieved by adding upstream and side magnetic shields to the prior art structure and then connecting up and downstream shields by means of magnetic side shields. The latter need not extend all the way from the downstream to the upstream shield in which case their thickness is increased relative to full side shields.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a vertical magnetic writer of the prior art.

FIG. 2 a is a field plot in the vicinity of the write pole showing that there is substantial magnetic field leakage in both the up and downstream directions.

FIG. 2 b is a field plot in the vicinity of the write pole showing that the addition of a downstream shield can significantly reduce downstream leakage but significant upstream leakage is still present.

FIG. 3 is a frontal view of the write pole showing the up and downstream shields.

FIG. 4 is an ABS view of a first embodiment of the invention

FIG. 5 is an ABS view of a second embodiment of the invention

FIG. 6 is a field plot in the vicinity of the write pole, for the present invention, confirming that there is now negligible magnetic flux leakage in both the up and downstream directions.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

In this invention, we disclose a perpendicular magnetic writer design with magnetic shields at both the leading and trailing edges of the write pole, together with side shields.

The invention has been realized in two embodiments. We start our description with the portion of these structures that is common to both of them:

Referring initially to FIG. 1, magnetic yoke 11 is surrounded by field coil 12 and includes main pole 13 that terminates as a write pole tip at the recording surface 17. Return pole 14 conveys the magnetic flux generated by coil 12 down to within a distance S of the recording surface while downstream shield 15, running parallel to the recording surface, completes the magnetic circuit with the exception of gap g1 into which some of the write field is diverted. The main part of the flux passes through recording layer 17, into SUL 16, and then back up into downstream shield 15 on the far side of g1. Also seen in the figure is the read head assembly that comprises read head 19—usually a GMR (Giant Magneto-Resistance) head—which is magnetically shielded from both sides by read head shields 18 that are situated a short distance upstream from write pole 13. Note that the terms ‘up’ and ‘down’ stream refer to which part of the assembly reaches a given spot on the recording surface first.

1st Embodiment

Referring now to FIG. 3, we show a view of write pole 13 as it would be seen when looking in direction D (of FIG. 1). Also seen in FIG. 3 is downstream shield 15 lying in a plane below that of the figure. This corresponds to what is shown in FIG. 1, but, in a departure from the prior art, upstream shield 32 has been inserted parallel to shield 15 located between write pole 13 and the closest of the two read head shields 18, so that it lies in a plane above that of the figure.

An important additional novel feature is illustrated in FIG. 4. This is the inclusion of side shields 31 a and 31 b that magnetically connect the up and down stream shields to one another so the write head is now fully shielded on all four sides. This can be seen more clearly in FIG. 4 which is an ABS view of the structure in the vicinity of the write pole i.e. the view seen when looking up at the Air Bearing Surface (that parallels layer 17).

The spacing between upstream shield 32 and write pole 13 is between about 0.1 and 1 microns while the spacing between downstream shield 15 and write pole 13 is between about 0.03 and 0.2 microns. Side shields 31 a and 31 b are located between about 0.05 and 0.2 microns from write pole 13 and they are between about 0.1 and 5 microns wide (along a direction normal to the plane of the figure). As a result, the bottom surfaces of the side shields will, in general, be coplanar with the write pole's bottom surface.

For the first embodiment, the upstream leakage outside said side shields is less than about 10% while the downstream leakage outside the side shields is less than about 10%. A detailed field plot of for the area immediately around the write pole can be seen in FIG. 6. This much improved magnetic isolation of the write pole makes it possible for write fields of up to about 12 kOe to be utilized.

2nd Embodiment

This embodiment is the same in its appearance as the first embodiment when viewed in direction D i.e. as seen in FIG. 3 The differences between the first and second embodiments become clear by looking at FIG. 5 which, like FIG. 4, is an ABS view. In this case, the side shields (now designated as 51) are magnetically connected to downstream shield 15 but do not extend all the way to upstream shield 32. Typically, side shields 51 extend from downstream shield 15 to within 1 micron of upstream shield 32. Because of this, it is necessary that they be thicker than 31 a and 31 b, typically having thicknesses between about 0.1 and 5 microns.

For the second embodiment, the upstream leakage outside the side shields is less than about 10% while the downstream leakage outside the side shields is less than about 10%. A detailed field plot for the area immediately around the write pole can be seen in FIG. 6. This much improved magnetic isolation of the write pole makes it possible for write fields of up to about 12 kOe to be utilized.

Claims (32)

1. A method to eliminate downstream flux leakage from a perpendicular magnetic writer, comprising:
providing a magnetic yoke having first and second non-parallel parts, said first part terminating as a downstream shield having a planar lower surface;
providing a conductive coil that surrounds said yoke;
providing a main pole having first and second ends;
the first end of the main pole being in magnetic contact with the magnetic yoke's second part, extending therefrom so that its second end is a perpendicular write pole having a bottom surface that is coplanar with said downstream shield lower surface;
said downstream shield being spaced a first distance from said write pole;
providing a read head shield located upstream from said write pole;
inserting an upstream shield between the write pole and the read head shield, said upstream shield being spaced a second distance from the write pole; and
magnetically connecting said upstream and downstream shields by means of side shields located on opposing sides of the write pole.
2. The method described in claim 1 wherein said first distance, between said downstream shield and said write pole, is between about 0.03 and 0.2 microns.
3. The method described in claim 1 wherein said second distance, between said upstream shield and said write pole, is between about 0.1 and 1 microns.
4. The method described in claim 1 wherein upstream leakage outside said side shields is less than about 10%.
5. The method described in claim 1 wherein downstream leakage outside said side shields is less than about 10%.
6. The method described in claim 1 wherein said write pole can safely provide a write field of up to about 12 kOe.
7. The method described in claim 1 wherein said side shields are between about 0.05 and 0.2 microns from said write pole.
8. The method described in claim 1 wherein said side shields are between about 0.1 and 5 microns wide.
9. The method described in claim 1 wherein said side shields have bottom surfaces that are coplanar with said write pole bottom surface.
10. A method to eliminate downstream flux leakage from a perpendicular magnetic writer, comprising:
providing a magnetic yoke having first and second non-parallel parts, said first part terminating as a downstream shield having a planar lower surface;
providing a conductive coil that surrounds said yoke;
providing a main pole having first and second ends;
the first end of the main pole being in magnetic contact with the magnetic yoke's second part, extending therefrom so that its second end is a perpendicular write pole having a bottom surface that is coplanar with said downstream shield lower surface;
said downstream shield being spaced a first distance from said write pole;
providing a read head shield located upstream from said write pole;
inserting an upstream shield between the write pole and the read head shield, said upstream shield being spaced a second distance from the write pole; and
attaching to said downstream shield side shields located on opposing sides of the write pole and having a thickness of at least 0.1 microns, that extend from said downstream shield to within 1 micron of said upstream shield.
11. The method described in claim 10 wherein said first distance, between said downstream shield and said write pole, is between about 0.03 and 0.2 microns.
12. The method described in claim 10 wherein said second distance, between said upstream shield and said write pole, is between about 0.1 and 1 microns.
13. The method described in claim 10 wherein upstream leakage outside said side shields is less than about 10%.
14. The method described in claim 10 wherein downstream leakage outside said side shields is less than about 10%.
15. The method described in claim 10 wherein said write pole can safely provide a write field of up to about 12 kOe.
16. The method described in claim 10 wherein said side shields are between about 0.05 and 0.2 microns from said write pole.
17. The method described in claim 10 wherein said side shields are between about 0.1 and 1 microns wide.
18. The method described in claim 10 wherein said side shields have bottom surfaces that are coplanar with said write pole bottom surface.
19. A perpendicular magnetic writer, comprising:
a magnetic yoke having first and second non-parallel parts, said first part terminating as a downstream shield having a planar lower surface;
a conductive coil that surrounds said yoke;
a main pole having first and second ends;
the first end of the main pole being in magnetic contact with the magnetic yoke's second part, extending therefrom so that its second end is a perpendicular write pole having a bottom surface that is coplanar with said downstream shield lower surface;
said downstream shield being spaced a first distance from said write pole;
a read head shield located upstream from said write pole;
an upstream shield between the write pole and the read head shield, said upstream shield being spaced a second distance from the write pole; and
side shields, on opposing sides of the write pole, that magnetically connect said upstream and downstream shields.
20. The magnetic writer described in claim 19 wherein said first distance, between said downstream shield and said write pole, is between about 0.03 and 0.2 microns.
21. The magnetic writer described in claim 19 wherein said second distance, between said upstream shield and said write pole, is between about 0.1 and 1 microns.
22. The magnetic writer described in claim 19 wherein upstream leakage outside said side shields is less than about 10%.
23. The magnetic writer described in claim 19 wherein downstream leakage outside said side shields is less than about 10%.
24. The magnetic writer described in claim 19 wherein said write pole can safely provide a write field of up to about 12 kOe.
25. The magnetic writer described in claim 19 wherein said side shields are between about 0.05 and 0.2 microns from said write pole.
26. The magnetic writer described in claim 19 wherein said side shields are between about 0.1 and 5 microns wide.
27. The magnetic writer described in claim 19 wherein said side shields have bottom surfaces that are coplanar with said write pole bottom surface.
28. A perpendicular magnetic writer, comprising:
a magnetic yoke having first and second non-parallel parts, said first part terminating as a downstream shield having a planar lower surface;
a conductive coil that surrounds said yoke;
a main pole having first and second ends;
the first end of the main pole being in magnetic contact with the magnetic yoke's second part, extending therefrom so that its second end is a perpendicular write pole having a bottom surface that is coplanar with said downstream shield lower surface;
said downstream shield being spaced a first distance from said write pole;
a read head shield located upstream from said write pole;
an upstream shield between the write pole and the read head shield, said upstream shield being spaced a second distance from the write pole; and
attached to said downstream shield, side shields, located on opposing sides of the write pole and having a thickness of at least 0.1 microns, that extend from said downstream shield to within 1 microns of said upstream shield.
29. The magnetic writer described in claim 28 wherein said first distance, between said downstream shield and said write pole, is between about 0.03 and 0.2 microns.
30. The magnetic writer described in claim 28 wherein said second distance, between said upstream shield and said write pole, is between about 0.1 and 1 microns.
31. The magnetic writer described in claim 28 wherein upstream leakage outside said side shields is less than about 10%.
32. The magnetic writer described in claim 28 wherein downstream leakage outside said side shields is less than about 10%.
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Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050128637A1 (en) * 2003-12-16 2005-06-16 Seagate Technology Llc Head for perpendicular recording with reduced erasure
US20060012914A1 (en) * 2004-07-13 2006-01-19 Sae Magnetics (H.K.) Ltd. Thin film magnetic head, head gimbals assembly, head arm assembly, magnetic recording apparatus, and method of manufacturing thin film magnetic head
US20060092575A1 (en) * 2004-02-25 2006-05-04 Hitachi Global Storage Technologies Netherlands, B.V. Magnetic head and magnetic disk storage apparatus mounting the same
US20060119984A1 (en) * 2004-12-03 2006-06-08 Hitachi Global Storage Technologies Netherlands B.V. Magnetic head with soft magnetic shield and magnetic storage
US20060245109A1 (en) * 2005-04-27 2006-11-02 Hitachi Global Storage Technologies Perpendicular magnetic write head having a studded trailing shield compatible with read/write offset
US20060245108A1 (en) * 2005-04-27 2006-11-02 Hitachi Global Storage Technologies Flux shunt structure for reducing return pole corner fields in a perpendicular magnetic recording head
US20080112081A1 (en) * 2006-11-10 2008-05-15 Sae Magnetics (H.K.) Ltd. Perpendicular magnetic write head, method of manufacturing the same, and magnetic recording apparatus
US20080222879A1 (en) * 2007-03-16 2008-09-18 Tdk Corporation Method of manufacturing magnetic head and method of manufacturing magnetic head substructure
US20080222878A1 (en) * 2007-03-16 2008-09-18 Tdk Corporation Method of manufacturing magnetic head
US20080247087A1 (en) * 2007-04-06 2008-10-09 Tdk Corporation Magnetic head for perpendicular magnetic recording and method of manufacturing same, the magnetic head incuding pole layer and two shields sandwiching the pole layer
US20080259498A1 (en) * 2007-04-19 2008-10-23 Hitachi Global Storage Technologies Perpendicular write head with independent trailing shield designs
US20090122449A1 (en) * 2007-11-08 2009-05-14 Samsung Electronics Co., Ltd. Magnetic write head and method of manufacturing the same
US20090152235A1 (en) * 2007-12-13 2009-06-18 Wen-Chien David Hsiao Method of manufacturing a perpendicular magnetic write head with stepped trailing magnetic shield with electrical lapping guide control
US20110007428A1 (en) * 2009-07-13 2011-01-13 Seagate Technology Llc Write pole with a synthesized low magnetization shield
US20110075299A1 (en) * 2009-09-30 2011-03-31 Olson Trevor W Magnetic write heads for hard disk drives and method of forming same
US20110075295A1 (en) * 2009-09-30 2011-03-31 Zhang Sue S Slanted bump design for magnetic shields in perpendicular write heads and method of making same
US20110076393A1 (en) * 2009-09-30 2011-03-31 Bonhote Christian R Trailing plated step
US20110097601A1 (en) * 2009-10-26 2011-04-28 Headway Technologies, Inc. Wrap-around shielded writer with highly homogeneous shield material
US20110135959A1 (en) * 2009-12-09 2011-06-09 Liubo Hong Pmr writer and method of fabrication
US20110134569A1 (en) * 2009-12-09 2011-06-09 Allen Donald G Pmr writer and method of fabrication
US20110135962A1 (en) * 2009-12-09 2011-06-09 Liubo Hong Pmr writer and method of fabrication
US20110134568A1 (en) * 2009-12-09 2011-06-09 Yingjian Chen Pmr writer and method of fabrication
US8000064B2 (en) 2007-12-13 2011-08-16 Tdk Corporation Thin-film magnetic head for perpendicular magnetic recording and method of making the same
US8015692B1 (en) 2007-11-07 2011-09-13 Western Digital (Fremont), Llc Method for providing a perpendicular magnetic recording (PMR) head
US8166632B1 (en) 2008-03-28 2012-05-01 Western Digital (Fremont), Llc Method for providing a perpendicular magnetic recording (PMR) transducer
US8166631B1 (en) 2008-08-27 2012-05-01 Western Digital (Fremont), Llc Method for fabricating a magnetic recording transducer having side shields
US8231796B1 (en) 2008-12-09 2012-07-31 Western Digital (Fremont), Llc Method and system for providing a magnetic recording transducer having side shields
US8276258B1 (en) 2008-08-26 2012-10-02 Western Digital (Fremont), Llc Method for fabricating a magnetic recording transducer
US8630153B1 (en) 2012-11-05 2014-01-14 Headway Technologies, Inc. TAMR writer with a concave leading shield for enhanced field magnitude
US8720044B1 (en) 2008-09-26 2014-05-13 Western Digital (Fremont), Llc Method for manufacturing a magnetic recording transducer having side shields
US8793866B1 (en) 2007-12-19 2014-08-05 Western Digital (Fremont), Llc Method for providing a perpendicular magnetic recording head
US8879207B1 (en) 2011-12-20 2014-11-04 Western Digital (Fremont), Llc Method for providing a side shield for a magnetic recording transducer using an air bridge
US8914969B1 (en) 2012-12-17 2014-12-23 Western Digital (Fremont), Llc Method for providing a monolithic shield for a magnetic recording transducer
US8980109B1 (en) 2012-12-11 2015-03-17 Western Digital (Fremont), Llc Method for providing a magnetic recording transducer using a combined main pole and side shield CMP for a wraparound shield scheme

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7031121B2 (en) * 2003-07-30 2006-04-18 Hitachi Global Storage Technologies Netherlands B.V. Perpendicular recording magnetic head with a write shield magnetically coupled to a first pole piece
JP4260002B2 (en) * 2003-12-24 2009-04-30 ヒタチグローバルストレージテクノロジーズネザーランドビーブイ Magnetic head and its production method and a magnetic recording and reproducing apparatus
JP2006252694A (en) * 2005-03-11 2006-09-21 Hitachi Global Storage Technologies Netherlands Bv Magnetic head for vertical recording
US7365942B2 (en) * 2005-06-22 2008-04-29 Headway Technologies, Inc. Thin-film magnetic head
KR100763904B1 (en) * 2005-08-12 2007-10-05 삼성전자주식회사 Perpendicular magnetic recording head and manufacturing methof for the same
JP4499044B2 (en) * 2006-01-04 2010-07-07 ヒタチグローバルストレージテクノロジーズネザーランドビーブイ The perpendicular magnetic recording medium and a magnetic storage apparatus using the same
US7609479B2 (en) * 2006-03-10 2009-10-27 Headway Technologies, Inc. Magnetic head for perpendicular magnetic recording and method of manufacturing same
US7538976B2 (en) * 2006-04-25 2009-05-26 Hitachi Global Storage Technologies B.V. Trailing shield design for reducing wide area track erasure (water) in a perpendicular recording system
US7576951B2 (en) * 2006-04-25 2009-08-18 Hitachi Global Storage Technologies Netherlands B.V. Perpendicular magnetic write head having a magnetic write pole with a concave trailing edge
JP4287457B2 (en) * 2006-05-11 2009-07-01 株式会社東芝 Perpendicular recording magnetic head and a magnetic disk drive
US7715147B2 (en) * 2006-10-27 2010-05-11 Hitachi Global Storage Technologies Netherlands B.V. Magnetic write head having a shield that extends below the leading edge of the write pole
US20080112088A1 (en) * 2006-11-13 2008-05-15 Hitachi Global Storage Technologies Perpendicular magnetic write head having a wrap around trailing shield with a flux return path
US7889458B2 (en) * 2006-11-13 2011-02-15 Hitachi Global Storage Technologies Netherlands B.V. Write head with self-cross biased pole for high speed magnetic recording
US7467461B2 (en) * 2007-03-20 2008-12-23 Hitachi Global Storage Technologies Netherlands B.V. Additive gap process to define trailing and side shield gap for a perpendicular write head
US8102623B2 (en) * 2007-08-31 2012-01-24 Tdk Corporation Thin-film magnetic head with a magnetic pole having an inclined step at its top end section surface, magnetic head assembly with the thin-film magnetic head, magnetic disk drive apparatus with the magnetic head assembly, and manufacturing method of thin-film magnetic head
US8000059B2 (en) * 2007-12-12 2011-08-16 Hitachi Global Storage Technologies Netherlands B.V. Perpendicular magnetic write head with a thin wrap around magnetic shield
US8795763B2 (en) * 2007-12-26 2014-08-05 Headway Technologies, Inc. Perpendicular magnetic medium with shields between tracks
US8432639B2 (en) * 2010-05-06 2013-04-30 Headway Technologies, Inc. PMR writer with π shaped shield

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4547824A (en) * 1982-12-17 1985-10-15 International Business Machines Corporation Dual biasing for integrated inductive MR head
US4656546A (en) 1985-01-22 1987-04-07 Digital Equipment Corporation Vertical magnetic recording arrangement
US4881143A (en) * 1988-01-19 1989-11-14 Hewlett-Packard Company Compensated magneto-resistive read head
US4935832A (en) * 1987-04-01 1990-06-19 Digital Equipment Corporation Recording heads with side shields
US5003423A (en) 1984-12-03 1991-03-26 Olympus Optical Company Ltd. Vertical recording magnetic head
US5075956A (en) 1988-03-16 1991-12-31 Digital Equipment Corporation Method of making recording heads with side shields
US5311387A (en) * 1987-07-29 1994-05-10 Digital Equipment Corporation Three-pole magnetic recording head with high readback resolution
US5515221A (en) 1994-12-30 1996-05-07 International Business Machines Corporation Magnetically stable shields for MR head
US20020071208A1 (en) * 2000-12-08 2002-06-13 Sharat Batra Perpendicular magnetic recording head to reduce side writing
US20020176214A1 (en) * 2001-05-23 2002-11-28 Shukh Alexander M. Writer for perpendicular recording with controlled write width
US20040100737A1 (en) * 2002-11-26 2004-05-27 Hitachi, Ltd. Magnetic recording head
US20040212923A1 (en) * 2003-04-28 2004-10-28 Kabushiki Kaisha Toshiba Perpendicular magnetic recording head and magnetic disc apparatus
US6842313B1 (en) * 2002-04-08 2005-01-11 Maxtor Corporation Floating down stream perpendicular write head shield
US20050068669A1 (en) * 2003-09-26 2005-03-31 Yimin Hsu Head for perpendicular recording with a floating trailing shield
US20050068678A1 (en) * 2003-09-30 2005-03-31 Yimin Hsu Head for perpendicular magnetic recording with a shield structure connected to the return pole piece
US20050068671A1 (en) * 2003-09-29 2005-03-31 Yimin Hsu Magnetic transducer for perpendicular magnetic recording with single pole write head with trailing shield
US20050141142A1 (en) * 2003-12-24 2005-06-30 Hitachi Global Storage Technologies Netherlands, B.V. Magnetic recording head and magnetic disk storage apparatus mounting the magnetic head

Patent Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4547824A (en) * 1982-12-17 1985-10-15 International Business Machines Corporation Dual biasing for integrated inductive MR head
US5003423A (en) 1984-12-03 1991-03-26 Olympus Optical Company Ltd. Vertical recording magnetic head
US4656546A (en) 1985-01-22 1987-04-07 Digital Equipment Corporation Vertical magnetic recording arrangement
US4935832A (en) * 1987-04-01 1990-06-19 Digital Equipment Corporation Recording heads with side shields
US5311387A (en) * 1987-07-29 1994-05-10 Digital Equipment Corporation Three-pole magnetic recording head with high readback resolution
US4881143A (en) * 1988-01-19 1989-11-14 Hewlett-Packard Company Compensated magneto-resistive read head
US5075956A (en) 1988-03-16 1991-12-31 Digital Equipment Corporation Method of making recording heads with side shields
US5515221A (en) 1994-12-30 1996-05-07 International Business Machines Corporation Magnetically stable shields for MR head
US5621592A (en) 1994-12-30 1997-04-15 International Business Machines Corporation Magnetic head with magnetically stable shield layers and/or write poles
US20020071208A1 (en) * 2000-12-08 2002-06-13 Sharat Batra Perpendicular magnetic recording head to reduce side writing
US20020176214A1 (en) * 2001-05-23 2002-11-28 Shukh Alexander M. Writer for perpendicular recording with controlled write width
US6842313B1 (en) * 2002-04-08 2005-01-11 Maxtor Corporation Floating down stream perpendicular write head shield
US20040100737A1 (en) * 2002-11-26 2004-05-27 Hitachi, Ltd. Magnetic recording head
US20040212923A1 (en) * 2003-04-28 2004-10-28 Kabushiki Kaisha Toshiba Perpendicular magnetic recording head and magnetic disc apparatus
US20050068669A1 (en) * 2003-09-26 2005-03-31 Yimin Hsu Head for perpendicular recording with a floating trailing shield
US20050068671A1 (en) * 2003-09-29 2005-03-31 Yimin Hsu Magnetic transducer for perpendicular magnetic recording with single pole write head with trailing shield
US20050068678A1 (en) * 2003-09-30 2005-03-31 Yimin Hsu Head for perpendicular magnetic recording with a shield structure connected to the return pole piece
US20050141142A1 (en) * 2003-12-24 2005-06-30 Hitachi Global Storage Technologies Netherlands, B.V. Magnetic recording head and magnetic disk storage apparatus mounting the magnetic head

Cited By (56)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7233457B2 (en) * 2003-12-16 2007-06-19 Seagate Technology Llc Head for perpendicular recording with reduced erasure
US20050128637A1 (en) * 2003-12-16 2005-06-16 Seagate Technology Llc Head for perpendicular recording with reduced erasure
US20060092575A1 (en) * 2004-02-25 2006-05-04 Hitachi Global Storage Technologies Netherlands, B.V. Magnetic head and magnetic disk storage apparatus mounting the same
US7684149B2 (en) * 2004-02-25 2010-03-23 Hitachi Global Storage Technologies Netherlands B.V. Magnetic head and magnetic disk storage apparatus mounting the same
US20060012914A1 (en) * 2004-07-13 2006-01-19 Sae Magnetics (H.K.) Ltd. Thin film magnetic head, head gimbals assembly, head arm assembly, magnetic recording apparatus, and method of manufacturing thin film magnetic head
US20060119984A1 (en) * 2004-12-03 2006-06-08 Hitachi Global Storage Technologies Netherlands B.V. Magnetic head with soft magnetic shield and magnetic storage
US7450349B2 (en) * 2004-12-03 2008-11-11 Hitachi Global Storage Technologies Netherlands B.V. Magnetic head with soft magnetic shield and magnetic storage
US20060245108A1 (en) * 2005-04-27 2006-11-02 Hitachi Global Storage Technologies Flux shunt structure for reducing return pole corner fields in a perpendicular magnetic recording head
US20060245109A1 (en) * 2005-04-27 2006-11-02 Hitachi Global Storage Technologies Perpendicular magnetic write head having a studded trailing shield compatible with read/write offset
US7639450B2 (en) * 2005-04-27 2009-12-29 Hitachi Global Storage Technologies Netherlands B.V. Flux shunt structure for reducing return pole corner fields in a perpendicular magnetic recording head
US7551396B2 (en) * 2005-04-27 2009-06-23 Hitachi Global Storage Technologies Netherlands B.V. Perpendicular magnetic write head having a studded trailing shield compatible with read/write offset
US20080112081A1 (en) * 2006-11-10 2008-05-15 Sae Magnetics (H.K.) Ltd. Perpendicular magnetic write head, method of manufacturing the same, and magnetic recording apparatus
US8400732B2 (en) * 2006-11-10 2013-03-19 Sae Magnetics (H.K.) Ltd. Perpendicular magnetic write head, having side shields coupled to a leading shield and apart from a trailing shield
US20080222878A1 (en) * 2007-03-16 2008-09-18 Tdk Corporation Method of manufacturing magnetic head
US20080222879A1 (en) * 2007-03-16 2008-09-18 Tdk Corporation Method of manufacturing magnetic head and method of manufacturing magnetic head substructure
US7832085B2 (en) 2007-03-16 2010-11-16 Tdk Corporation Method of manufacturing magnetic head and method of manufacturing magnetic head substructure
US7995308B2 (en) 2007-04-06 2011-08-09 Tdk Corporation Magnetic head for perpendicular magnetic recording and method of manufacturing same, the magnetic head incuding pole layer and two shields sandwiching the pole layer
US20080247087A1 (en) * 2007-04-06 2008-10-09 Tdk Corporation Magnetic head for perpendicular magnetic recording and method of manufacturing same, the magnetic head incuding pole layer and two shields sandwiching the pole layer
US20080259498A1 (en) * 2007-04-19 2008-10-23 Hitachi Global Storage Technologies Perpendicular write head with independent trailing shield designs
US7894159B2 (en) 2007-04-19 2011-02-22 Hitachi Global Storage Technologies Netherlands B.V. Perpendicular write head with independent trailing shield designs
US8015692B1 (en) 2007-11-07 2011-09-13 Western Digital (Fremont), Llc Method for providing a perpendicular magnetic recording (PMR) head
US20090122449A1 (en) * 2007-11-08 2009-05-14 Samsung Electronics Co., Ltd. Magnetic write head and method of manufacturing the same
US8233236B2 (en) * 2007-11-08 2012-07-31 Seagate Technology International Magnetic write head with side shield and gap layer
US20090152235A1 (en) * 2007-12-13 2009-06-18 Wen-Chien David Hsiao Method of manufacturing a perpendicular magnetic write head with stepped trailing magnetic shield with electrical lapping guide control
US8000064B2 (en) 2007-12-13 2011-08-16 Tdk Corporation Thin-film magnetic head for perpendicular magnetic recording and method of making the same
US7990651B2 (en) 2007-12-13 2011-08-02 Hitachi Global Storage Technologies Netherlands B.V. Method of manufacturing a perpendicular magnetic write head with stepped trailing magnetic shield with electrical lapping guide control
US8793866B1 (en) 2007-12-19 2014-08-05 Western Digital (Fremont), Llc Method for providing a perpendicular magnetic recording head
US8166632B1 (en) 2008-03-28 2012-05-01 Western Digital (Fremont), Llc Method for providing a perpendicular magnetic recording (PMR) transducer
US8576517B1 (en) 2008-08-26 2013-11-05 Western Digital (Fremont), Llc Magnetic recording transducer having side shields between the coils and the air-bearing surface
US8276258B1 (en) 2008-08-26 2012-10-02 Western Digital (Fremont), Llc Method for fabricating a magnetic recording transducer
US8166631B1 (en) 2008-08-27 2012-05-01 Western Digital (Fremont), Llc Method for fabricating a magnetic recording transducer having side shields
US8488272B1 (en) 2008-08-27 2013-07-16 Western Digital (Fremont), Llc Magnetic recording transducer having side shields
US8720044B1 (en) 2008-09-26 2014-05-13 Western Digital (Fremont), Llc Method for manufacturing a magnetic recording transducer having side shields
US8231796B1 (en) 2008-12-09 2012-07-31 Western Digital (Fremont), Llc Method and system for providing a magnetic recording transducer having side shields
US8472136B2 (en) 2009-07-13 2013-06-25 Seagate Technology Llc Write pole with a synthesized low magnetization shield
US20110007428A1 (en) * 2009-07-13 2011-01-13 Seagate Technology Llc Write pole with a synthesized low magnetization shield
US20110075295A1 (en) * 2009-09-30 2011-03-31 Zhang Sue S Slanted bump design for magnetic shields in perpendicular write heads and method of making same
US8724258B2 (en) 2009-09-30 2014-05-13 HGST Netherlands B.V. Slanted bump design for magnetic shields in perpendicular write heads and method of making same
US20110076393A1 (en) * 2009-09-30 2011-03-31 Bonhote Christian R Trailing plated step
US20110075299A1 (en) * 2009-09-30 2011-03-31 Olson Trevor W Magnetic write heads for hard disk drives and method of forming same
US8449752B2 (en) 2009-09-30 2013-05-28 HGST Netherlands B.V. Trailing plated step
US8842389B2 (en) * 2009-10-26 2014-09-23 Headway Technologies, Inc. Wrap-around shielded writer with highly homogeneous shield material
US20110097601A1 (en) * 2009-10-26 2011-04-28 Headway Technologies, Inc. Wrap-around shielded writer with highly homogeneous shield material
US20110135959A1 (en) * 2009-12-09 2011-06-09 Liubo Hong Pmr writer and method of fabrication
US20110134568A1 (en) * 2009-12-09 2011-06-09 Yingjian Chen Pmr writer and method of fabrication
US8498078B2 (en) 2009-12-09 2013-07-30 HGST Netherlands B.V. Magnetic head with flared write pole having multiple tapered regions
US8553360B2 (en) 2009-12-09 2013-10-08 HGST Netherlands B.V. Magnetic recording head having write pole with higher magnetic moment towards trailing edge
US20110135962A1 (en) * 2009-12-09 2011-06-09 Liubo Hong Pmr writer and method of fabrication
US8233235B2 (en) 2009-12-09 2012-07-31 Hitachi Global Storage Technologies Netherlands B.V. PMR writer having a tapered write pole and bump layer and method of fabrication
US20110134569A1 (en) * 2009-12-09 2011-06-09 Allen Donald G Pmr writer and method of fabrication
US8451560B2 (en) 2009-12-09 2013-05-28 HGST Netherlands B.V. Magnetic head with flared write pole with multiple non-magnetic layers thereover
US8879207B1 (en) 2011-12-20 2014-11-04 Western Digital (Fremont), Llc Method for providing a side shield for a magnetic recording transducer using an air bridge
US8630153B1 (en) 2012-11-05 2014-01-14 Headway Technologies, Inc. TAMR writer with a concave leading shield for enhanced field magnitude
US9330690B2 (en) 2012-11-05 2016-05-03 Headway Technologies, Inc. Method of forming a TAMR writer with a concave leading shield for enhanced field magnitude
US8980109B1 (en) 2012-12-11 2015-03-17 Western Digital (Fremont), Llc Method for providing a magnetic recording transducer using a combined main pole and side shield CMP for a wraparound shield scheme
US8914969B1 (en) 2012-12-17 2014-12-23 Western Digital (Fremont), Llc Method for providing a monolithic shield for a magnetic recording transducer

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